code: def gamma_correct_rgb(cs, r, g, b):
      r = gamma_correct(cs, r)
      g = gamma_correct(cs, g)
      b = gamma_correct(cs, b)
      return (r, g, b)
  
file_path: vispy/examples/demo/gloo/galaxy/galaxy_specrend.py
imports: import math
label_desc: Use image node_id 7 for calling a global function with example usage: gamma_correct_rgb(cs, r, g, b) and returns: r,  g,  b